Ray Johnson of the U.S. Forest Service says while thunderstorms are common this time of year, Monday's downpour was the first big one of the season on the mountain, leaving the Lower Lee Meadows covered in rocks and debris.

“We are still expecting some weather that could potentially make this happen again the rest of the week,” Johnson said.

For now, the Old Mill Picnic Area remains closed. The road in expected to be cleared in the next few days.

While no injuries were reported from the flash flood, the Forest Service wants to keep it that way. Earlier this month, 10 people were killed in Arizona when flooding swept through a popular swimming hole in Tonto National Forest.

Johnson says conditions here are similar. A threat of fire also remains.

“We had a tremendous amount of lightning with that thunderstorm, so we may have fire as things dry out, things that are smoldering,” he said.